feat: add NimmerSky modlist foundation

- Visions of Vaermina reference list parsed into sections
- Community Shaders guide with PGPatcher setup
- Body/animation stack documentation
- CSV/ODS tracking spreadsheets

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

sections/Modder_Tools.txt

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+-CS Frame Generation
+-SOS - CS Brightness Patch
+-Lux CS Patch
+-CS Particle Patch
+-Community Shaders Light Limit Fix Light - All-Maker Stones
+-Obscure's College of Winterhold Meshes Optimized and Merged for Community Shaders
+-NAT.CS III
+-Dynamic Display Settings
+-CS Lights
+-Light Placer
+-Terrain Variation - Community Shaders
+-Terrain Blending - Community Shaders
+-Terrain Shadows - Wyrmstooth
+-Terrain Shadows - Vigilant
+-Terrain Shadows - Unslaad
+-Terrain Shadows - The Cause CC
+-Terrain Shadows - Skyrim Extended Cut SaintSeducer
+-Terrain Shadows - Olenveld
+-Terrain Shadows - Improved Follower Dialogue Lydia
+-Terrain Shadows - Glenmoril
+-Terrain Shadows - Dac0da
+-Terrain Shadows - Heightmaps
+-Terrain Shadows
+-Wetness Effects
+-Water Effects
+-Subsurface Scattering
+-Sky Sync - Community Shaders
+-Skylighting
+-Screen Space Global Illumination (SSGI)
+-Screen Space Shadows
+-Light Limit Fix
+-Inverse Square Lighting - Community Shaders
+-Grass Lighting
+-Grass Collision
+-First person magic hand light fix
+-Cloud Shadows
+-Community Shaders
+-DALC Fix Preset (Performance)